Enabling Jumbo frame on Cat OS ports

Answered Question
Apr 27th, 2010
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Could anyone explain why this is happening?



ABCD-SJ-6500-1> (enable) set port jumbo 6/27 enable

Do you want to modify the following ports: 6/25-32 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

P.S. - All ports between 6/25 - 32 are on different vlans and etherchannel, so not sure why its asking 6/25 - 32?
Thanks!
Correct Answer by Jon Marshall about 7 years 4 days ago

vbankar wrote:


Its on module 6, details below:



Mod Slot Ports Module-Type               Model               Sub Status

--- ---- ----- ------------------------- ------------------- --- --------

1   1    2     1000BaseX Supervisor      WS-X6K-SUP1A-2GE    yes ok

6   6    48    10/100/1000BaseT Ethernet WS-X6548-GE-TX      no  ok


According to the release notes this is how the 6548 module is broken down -


Number of ports: 48
Number of port groups: 2
Port ranges per port group: 1-24, 25-48

The aggregate bandwidth of each set of 8 ports (1-8, 9-16, 17-24, 25-32, 33-40, and 41-48) is 1 Gbps.


So it's not the port group but each set of 8 ports has one ASIC and i suspect this is what you are seeing.


Jon

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Jon Marshall Tue, 04/27/2010 - 11:57
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vbankar wrote:


Could anyone explain why this is happening?



ABCD-SJ-6500-1> (enable) set port jumbo 6/27 enable

Do you want to modify the following ports: 6/25-32 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

P.S. - All ports between 6/25 - 32 are on different vlans and etherchannel, so not sure why its asking 6/25 - 32?
Thanks!


I suspect this is to do with port groupings on the module. The same happens when you apply a QOS policy to one port ie. the PFC then applies it to all ports in the port group.


What module is it ?


Jon

vbankar Tue, 04/27/2010 - 12:57
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Its on module 6, details below:



Mod Slot Ports Module-Type               Model               Sub Status

--- ---- ----- ------------------------- ------------------- --- --------

1   1    2     1000BaseX Supervisor      WS-X6K-SUP1A-2GE    yes ok

6   6    48    10/100/1000BaseT Ethernet WS-X6548-GE-TX      no  ok

Correct Answer
Jon Marshall Tue, 04/27/2010 - 13:13
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vbankar wrote:


Its on module 6, details below:



Mod Slot Ports Module-Type               Model               Sub Status

--- ---- ----- ------------------------- ------------------- --- --------

1   1    2     1000BaseX Supervisor      WS-X6K-SUP1A-2GE    yes ok

6   6    48    10/100/1000BaseT Ethernet WS-X6548-GE-TX      no  ok


According to the release notes this is how the 6548 module is broken down -


Number of ports: 48
Number of port groups: 2
Port ranges per port group: 1-24, 25-48

The aggregate bandwidth of each set of 8 ports (1-8, 9-16, 17-24, 25-32, 33-40, and 41-48) is 1 Gbps.


So it's not the port group but each set of 8 ports has one ASIC and i suspect this is what you are seeing.


Jon

vbankar Tue, 04/27/2010 - 15:31
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That seems right, I tried couple of port on other 8 bundle as well and same thing happens. Thanks so much. One quick ques though - do you think this problem would get solved if we migrate from Cat OS to IOS?



ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/27 enable

Do you want to modify the following ports: 6/25-32 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/34 enable

Do you want to modify the following ports: 6/33-40 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/42 enable

Do you want to modify the following ports: 6/41-48 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

Jon Marshall Wed, 04/28/2010 - 00:38
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vbankar wrote:


That seems right, I tried couple of port on other 8 bundle as well and same thing happens. Thanks so much. One quick ques though - do you think this problem would get solved if we migrate from Cat OS to IOS?



ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/27 enable

Do you want to modify the following ports: 6/25-32 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/34 enable

Do you want to modify the following ports: 6/33-40 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)

ABCD-SJ-6500-1> (enable) set port jumbo 6/42 enable

Do you want to modify the following ports: 6/41-48 are you sure(y/n) [n]?n

ABCD-SJ-6500-1> (enable)


No it wouldn't make any difference upgrading to IOS as it is to do with how the PFC implements configuration on the modules.


Jon

vbankar Wed, 04/28/2010 - 00:59
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As the PFC sits on SUP, so will it help if I upgrade the current SUP 1A to SUP II? Or do you recommend upgrading the ws-x6548-ge-tx line card?


Thanks again!

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